Since July, I have been getting a message on iTunes saying that my Apple ID has been disabled. Now, I can no longer purchase apps on my device and on iTunes anymore.
Actually, now you do not have to enter a User and Password each time you want to play music from iTunes.....its a big joke to drive us all nuts and I think a successful joke too.
Usually this message means that you have a billing issue, unpaid order. You may want to sign into your account and look at the billing and payment info section.